138080281 has 8 divisors (see below), whose sum is σ = 143091720. Its totient is φ = 133085568.

The previous prime is 138080279. The next prime is 138080287. The reversal of 138080281 is 182080831.

It can be written as a sum of positive squares in 4 ways, for example, as 1190281 + 136890000 = 1091^2 + 11700^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138080281 - 2¹ = 138080279 is a prime.

It is a super-2 number, since 2×138080281² = 38132328002077922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138080287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14035 + ... + 21751.

It is an arithmetic number, because the mean of its divisors is an integer number (17886465).

Almost surely, 2^138080281 is an apocalyptic number.

It is an amenable number.

138080281 is a deficient number, since it is larger than the sum of its proper divisors (5011439).

138080281 is an equidigital number, since it uses as much as digits as its factorization.

138080281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8363.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 138080281 is about 11750.7566139377. The cubic root of 138080281 is about 516.8651145183.

The spelling of 138080281 in words is "one hundred thirty-eight million, eighty thousand, two hundred eighty-one".